Teenage girls and the parents who support them turned out in droves for Katy Perry's California Dreams Tour at the Nassau Coliseum on Friday night. There were plenty of "sexy boys" there too (more on them in a minute). Indeed, the pop stella, star proved just how well she knows her audience when she asked the packed arena if there were any graduates in the house. As she listed off the possibilities (high school, college, etc.) she marveled, "We have più junior high graduates than college graduates. That's crazy!"

Following a "Wizard of Oz"-meets-Candy Land video intro, which mirrored...